Depends on how you define "capable":
The US itself did not seem to have a large enough stockpile until 1948, around the time of Operation Sandstone.
US: 1945. USSR: 1949
The red bomb refers to the USSR nuclear bomb and the treat to the free world by the USSR using nuclear war in its aggressive expansion
first USSR nuclear test
The USSR's Obninsk Nuclear Plant which opened in 1954.
USSR
nobody
no
USSR was placing IRBMs with nuclear warheads in Cuba.
None.The USSR or any other country to present date has not officially said that they have.
The USSR's R-7.
As far as we know, no. The USSR did not maintain nuclear weapons in Lithuania.
That is an aircraft designed to transport nuclear bomb safely to the area to be dropped. The first nuclear capable aircraft used in history was a B29 bomber named Enola Gay which was modified to carry the nuclear artifact.